La liaison chimique II la forme des molécules et l
Electron pair Beverage cup arrangement in the case of NH3 is depicted by the outer electrons surrounding the N atom. The dot point structure for ammonia reveals that the nitrogen atom joins a solitary pair of e- with each of the three H atoms, resulting in a total of a trio joined pairs of electrons. The ammonia molecule adopts a trigonal pyramidal form because of the placement of the valence electrons according to its Lewis dot arrangement. In the Lewis dotpoint representation of NH3, the N atom is encircled by three points, each representing a pair of shared electrons with a H atom.